US2940798A - Relay or triple valve - Google Patents

Description

J1me 1960 c. L. WEBER 2,940,798-

I RELAY R TRIPLE VALVE Filed Dec. 28, 1956 l7 I6 44 40 :59 37 K 38 a 9 47 g i j 55 59 3 .l H 5 l3 so 27 as 57 F 52 5| /24 |2 n I I V ,45 54 I 57 53 6O I8 i 26 Z I I F I 9 25 6| 2o- 'i 6 8 l9 l K 52 77- i s7 53 I I 63 f 2 Li 64 INVENTOR. .1g 2 45 Charles L. Hebe] BY Jaw/50.46;;

ATTORNEY ?atented June 14, 1960 RELAY R TRIPLE VALVE Charles L. Weber, Pittsburgh,

house Air Brake Company, ration of Pennsylvania Pa., assign'or to Westing- Wilmerding, Pa., a corpo- This invention relates to a multi-purpose control valve device and more particularly to a valve device variously couditionable so as to operate as a triple valve device in fluid pressure operated railway braking apparatus at one time or as a relay valve device for general control use at another time.

Triple valve devices and relay valve devices have certain common elements such as an operating piston or diaphragm type piston and supply and release valve elements for causing supply of fluid under pressure to and release of fluid under pressure from a receiving device, such as a brake cylinder. However, in the case of a triple valve, the operating piston is subject to brake pipe pressure on one side and auxiliary reservoir pressure on the other and operation of the triple valve device is controlled by variations of pressure in the brake pipe. In a relay valve device the piston is subjected to a control fluid pressure on one side to cause supply of fluid under pressure to the receiving device, the piston being restored to its position for lapping-01f the supply of fluid under pressure to the receiving device when the pressure supplied to the receiving device acting on the piston device in opposition to the control pressure reaches substantial equivalency to the control pressure,

In view of the equivalency of the elements of a triple valve device and a relay valve device, therefore, it is possible to utilize the same valve elements in a cooperative manner to function either as a triple valve device or as a relay valve device provided suitable changes in the fluid pressure connections to the valve elements are made.

It is accordingly the principal object of the present invention to provide a multi-purpose valve device of the type described and employing changeover means for converting the valve device to operate alternatively as a triple valve device or as a relay valve device.

Another object is to provide a multi-purpose valve device of the type indicated in the foregoing object and characterized in that the changeover means is a manually operable valve selectively positionable in a first or a second position to condition the valve device to operate at one time in one fluid pressure system as a triple valve device and at another time in another fluid pressure system as a relay valve device.

Gther objects and advantages will be apparent from the following more detailed description of the invention.

In the accompanying drawings; Fig. l is a diagrammatic sectional view of the multi-purpose control valve device embodying the invention and showing a changeover valve in the position to condition the control valve device to operate as a triple valve device; and

Fig. 2 is a partial sectional view of the valve device of Fig. 1, showing the changeover valve moved to the position to condition the device to operate as a relay valve device.

Description As shown in Fig. l of the drawing, the multi-purpose control valve device comprises a casing section 1 embodying therein in a parallel arranged relationship a fluid pressure operated supply and release valve mechanism 2 and a manually operated changeover valve 3 operable to condition the valve mechanism 2 to operate either as a triple valve device or as a relay valve device according to the selected position of said changeover valve.

Considering the fluid pressure operated supply and 'release valve mechanism 2 in greater detail, said valve mechanism comprises two coaxially related valve members 4 and 5 operable by fluid pressure exerted on a diaphragm 6 operably connected to the member 4 and suitably secured in the casing section 1 by a clamping cover 7 attached to said casing section in any suitable manner.

Two chambers 8 and 9 are formed respectively at opposite sides of the diaphragm 6. Chamber 9 is connected by a bore 10 to a chamber 11 in the body 1, said chamber 11 being open to atmosphere through a passage 12 formed in the body 1. The chamber 11 is connected by a bore 13, coaxial with and of substantially the same diameter as the bore 10, to a chamber 14. Contained in chamber 14 is a disc valve member 5 which cooperates with an annular valve seat 15 formed on the casing surrounding the end of bore 13 and projecting into chamber 14. Interposed between the upper face of valve member 5 and a screw plug 16 closing the open end of chamber 14 is a spring 17 for resiliently seating said valve member on the seat 15 to normally close communication between said chamber and the bore 13.

The valve member 4 comprises a spool valve 18 slidably mounted in the bores 10 and 13. One end of the spool valve 18 extends into the chamber 9 and is connected centrally with the diaphragm 6 by means of two diaphragm followers 19 and 20 and a nut 21 having screwthreaded engagement with a stem 22 extending from said one end of said spool valve.

The spool valve 18 is provided intermediate its ends with two spaced annular grooves 23 and24 formed on the outer periphery thereof and with three, axially spacedapart O-ring seals 25, 26 and 27 disposed in corresponding annular recesses open to the peripheral surface of said spool valve; said rings having sealing and sliding contact with the wall of bores 10 and 13 to minimize leakage of fluid pressure from chamber 9 and the upper end of bore 13 to the annular groove 23 open to the peripheral surface of said spool valve between said rings and chamber 11, respectively. The groove 23 is open to the chamber 8 by way of a small port or choked passageway 31 in spool valve 18, said port opening into said groove and being connected to a longitudinally extending passageway 32 in said spool valve leading to the end thereof that is disposed in said chamber. The groove '24 is open to atmosphere by way-of the chamber 11 and passage 12. Groove 24 is also open to the bore 13 on the opposite side of O-ring seal 27 by way of a passageway 33 in spool valve 18, passageway 33 having one end opening into .said groove and the other opening at the free end of. the ,spool valve beneath valve member 5.

The changeover valve 3 comprises a tapered rotary valve element 35 spring-pressed into a tapered bore 36 in the casing section 1 by a spring 37 disposed between the large end of said valve element and a screw plug 38 closing the open end of bore 36. Extending upward from the large end of valve element 35 and formed integral therewith is an operating shaft 39 which extends through a bore in the screw plug 38. A sealing ring 40 disposed in an annular recess in the screw plug 38 has sealing contact with the shaft 39 to prevent leakage of fluid under pressure past said shaft to atmosphere.

A removable handle or wrench (not shown) may be mounted on an outer squared end of shaft 39 to efiect movement of rotary valve element 35 between the position in which it is shown in Fig. 1, in which the multil The rotary valve element 35 has a milled groove 43 which, in the position in which the valve element is shown in Fig. 1, establishes a communication between a passageway 44 formed in body 1 and leading to chamber 14, and

a passageway 45, also formed insaid body and leading to chamber 8" at the lower side of diaphragm 6. A branch of passageway 45opens at the surface of casing lthrough a tapped port, hereinafter identified as the fourth casing port for receiving a threaded pipe. V V j" The rota ryvalve element 35f s further provided with a transversely; drilled passage 47 opening at one end into the milled groove 43 and atthe other end at the peripheral surface of thevalve elementn With valve element 35 in the position in whichit is shown in Fig.2, the passage 47 together with the groove i3 form a first port establishing a communication betweenthe passageway 44- and a passageway 48; formed in body 1 and opening at the surface of easing hthrough a tapped port, hereinafter'identified as the first casing'port, for receiving a threaded'pipe.

Thevalve element35 also has three connected passages 50351 and 5 2 to form a second port, Passages 50 and 5 1 are so loc'ated as to registerwith' respective passages 55 a and 5 4 in the casing, Passage 55. Opens 'at the exterior nfr he a pg 1 th o h a app porn. h reinafter. identifies! a he eeond a i g p r Q'receive a r adedr p Passage 54 leads to and; opens, into the bore .at the greove, 23., Passage 52.0pens. at the lower end of the valve element into a chamber which is. connected bya Passage 53 to chamber 9 at the, upper side of diaphragm 6.

Withthe valve elementin the position in which it is shQwnin'Fig. 2, passage 50. registers with a passage 57 in the casing, which passage has'two branches, one of which 'opens into bore' 13 above seal ring 27 and the other of which opens at. the surface of easing 1 through a;tapped port, hereinafter referred to as the third. casing port for receiving. a threaded pipe, while passage 51 is lapped or closed at the surface of the tapered. bore- 36. With the valve device conditioned as shown inFig, 1, for, use as atriple valve device, the. valve; device may be connected in a fluid pressure brake system as shown,

with a brake pipe. 59 connected to passage 55,, a brake cylinder 60. connected to passage 57,..and an auxiliary rese v ir m1 t mp a e 5- With the valve device-conditioned as shownin. Fig, 2, passage 48 may be connectedthrough a suitable pipeor conduitto a. supply reservoir 62, while passage- 45, may be connected to the delivery pipe of a; self-lapping type controlvalve 63', which is also connected through. a suitable pipe tothe supply. reservoir. A brakecylinder 6011 may be connected tothe same passage 57 as in Fig. 1,

In; the operation of the multirpurpose. control valve device, assuming that the changeover valve 3. is in: the

position to condition. the multi-purpose control valve device to'operate. as a triple valve device, which is the position in which it is shown in Fig. l, that-the brake pipe..59, brake cylinder 60 and auxiliary reservoir 61 (are conneeted tov the multipurpose control valve device; as described; above and; are at atmospheric pressure, and:that the. spoolvvalve. 18.0ccupies the. position inwhichiit. is shownin; Fig... 1, fluid; under pressure supplied to charge the brake, pipe 59 tonormal pressure carried. therein, will;fiow.from.this pipe to the passageway 55 and through thepassage SQ'inVthe valve element-m the-passageway 54,.fromwhence-it flows througlithe annular groove 23-, choked. passageway 31 and passageway 32 in. the spool valve 18 'to the chamber 8 at the -lower. side. of; dia-.

phragm 6.v

Eluidnwhichiasupplied tothe chamber 8 flows therefi qm' by, way: of passageway; 45.10, the, auxiliary reservoir 61 reby'charging this reservoir withfluidpnderpres stirs? Fuidsupplied" to" the passageway also flows 4- through the milled groove 43 in the valve element 35 to the passageway 44 which leads to the chamber 14 above supply valve member 5, thereby charging said chamber to auxiliary reservoir pressure which, when the equipment is fully charged, is the same as'bra'ke pipe pressure.

The chamber 9 at theupper. side of; diaphragm 6 is charged from the brake pipe 59' by way of passageway 55, passages and 5 2 in val'veelement 35, and passageway 53 so that the opposite sidesof said diaphragm are subject to the same pressure when the auxiliary reservoir 61 is fully charged to brake pipe'pressure. I i

In the release position of the triple valve device, the brake cylinder is vented to atmosphere by way of the brake cylinder pipe connected to. passageway 57, bore 13, passageway 33 in spool'valve 18, chamber 11 and exhaust passageway 12. If, after the equipment is charged with fluid under pressure, a chosen reduction in pressure in brake pipe 59 is made at a service or anemergency rate, by means 'of a usual brake valve device (not shown), fluid wiIl also be correspondingly vented fromthe chamber 9 at the upper side of diaphragm 6 through passageway 53,'passages- 52 and 50 in valve element 35 and passageway 5$connected to brake pipe 5'9 At the same'time, fihid is vented from chamber 8=at the lower side of diaphragm 6't-hrough pas- "of pressure to be-created on opposite sides of; diaphragm 6 since' the pressure in chamber 85ca-nnot reduceas fast 'as'thepressure inchamber 9'. a f a Whena sufficient differential of'pressure' is created to overcome the friction hetweenspool valve 13' and the walls of bores 10' and 13; diaphragmf will bedefiected upwardly and through the medium of stem 22, shifts spool valve 18 relativeto the wall; of 'bores lfl arid I3. As the spol valve. 18 is thus shifted, it laps the passage 54in the body 1 thus'closing the communicationbetween the chamber Fr andsaid' passageway so as'to' prevent backfiow of fluid under pressure front the chamber Send the auxiliary reservoir 61itothe brake pipe 59: After flow through passageway 32 and choke 31 is' closed, the pres- 'surein chamber 9i'continu'es to reducethr'ough passage- 7 until the upper end thereof engages the lower face of supply valve member S'to close the communication between brake cylinder 69' and-atmosphere.

When; the-differentialiofpressure on opposite sides of diaphragm 6 i's-sufficient'th.overcome the force of spring '17.; spool. valveT 18f willic'ontinue its. upwardQmovement and; unseat supply. valv,e..me'mber 5 f'romyit's. seat 15'.

. With valve memher S unseatedQQa flhid.pressi relcommunication is established by whichhuidunder pressure is supplied from. auxiliary: reservoir 61 to thejbrake cylinder 69., this communicatiompxtendingfrom. the. auxiliary reservoir 61 by wayof passageway 45, groove43.- in valve element, 35,. passageway 44,. chamben 1T4; past unseated valve. 5 to bore. 13- and; thence. through. passageway 57 to;the:brake cylinder. 69. Withthe.above descrihed com munication established, fluid: under: pressure will flow from auxiliary reservoir 61 to brake; cylinder 60 until the pressure in chamber- Sconnected tov the. auxiliaryreservoir 61 is reduced-an amountsubstantially equal/torthe degree of brake pipe reduction in the chamber 9, whereupon the diaphragm 6 and spoolvalvelSe will move downwardly to a servicelapposition in which the supply valve member 5 engagesseat 15-andthuscloses ofiithefilrther flow of fluidunder. pressurefromthe auxiliary reservoir. 61 to the' brake cylinder 601 i If, after a limited application of the brakes has been effected, it is desired to increase the brake cylinder pressure, a further reduction in brake pipe pressure is effected (through the medium of the brake valve device) which causes the diaphragm 6 and spool valve 18 to move upwardly from service lap position toward service position unseating supply valve member from its seat so that fluid under pressure again flows from the auxiliary reservoir 61 to the brake cylinder 60. With supply valve member 5 thus unseated, fluid under pressure will con tinue to flow from the auxiliary reservoir to the brake cylinder until the pressure in chamber 8 is again reduced an amount substantially equal to the degree of brake pipe reduction in chamber 9, whereupon the diaphragm 6 and spool valve 18 will move downwardly to service lap position in which the supply valve member 5 again engages seat 15 and thus closes ofI further flow of fluid under pressure from the auxiliary reservoir to the brake cylinder.

From the above it will be evident that it is possible to obtain any brake cylinder pressure desired up to a full service or an emergency application in which auxiliary reservoir pressure and brake cylinder pressure equalize, in a series of small increments or stages.

To eflect a release of the brakes after a service or an emergency application, fluid under pressure is supplied to the brake pipe 59 from whence it flows to chamber 9 through passageway 55, passages 50 and 52 and passageway 53.

The increase in brake pipe pressure in chamber 9 creates a differential of pressure on the diaphragm 6 which causes the diaphragm and thereby spool valve 18 to move to release position in which position they are shown in Fig. 1 of the drawing. In release position, the choke 31 is open through annular groove 23 to the passageway 54, so that fluid under pressure is permitted to flow from the brake pipe 59 to chamber 8 and the auxiliary reservoir 61 through the communication which has been hereinbefore described in connection with the initial charging of the equipment.

With fluid under pressure flowing from the brake pipe 59 to chambers 9 and 8 and auxiliary reservoir 61 as described above, said chambers and reservoir will be charged to the normal brake pipe pressure carried on the train and brake cylinder 60 will be reconnected to atmosphere by way of passage 57, bore 13, passage 33 in spool valve 18 and exhaust passage 12, thereby eflecting release of the brake application.

Subsequent to a release of the brakes, a reapplication can be effected to any desired degree by reducing brake pipe pressure an amount corresponding to the degree of brake cylinder pressure desired.

Now let it be supposed that it is desired to condition the multi-purpose control valve device to operate as a relayvalve device. To do so, the rotary valve element 35'of the changeover valve 3 is manually rotated, as by means of a handle or a wrench applied to the squared end of shaft 39, from the position in which it is shown in Fig. l to the position in which it is shown in Fig. 2. 7 Furthermore, let it be assumed that the fluid pressure supply reservoir 62 is connected by a suitable pipe to the passage 48, that a brake cylinder or other external fluid pressure operated device such as a fluid motor 60a is connected to passage 57, and that a control valve device 63 is connected to control the supply of fluid under pressure from the supply reservoir 62, or any other suitable source of fluid pressure, to the passage 45.

it may be noted that the chamber 9 and brake cylinder or fluid motor 60a are connected to atmosphere at this time. The chamber 9 is connected by passageway 53, passages 52 and 50 to passageway 57 to which fluid motor 60a is connected. The passageway 57 opens into the bore 13 which is connected to atmosphere through passageway 33, chamber 11 and passage 12.

In the operation of the multi-purpose control valve 6 device as a relay valve device, assuming that the supply reservoir 62 is charged with fluid to some chosen pressure, let it be supposed that the control valve device 63 is operated to cause the supply of fluid under pressure from supply reservoir 62 to passageway 45 and to chamber 8 until the pressure in said chamber is built up to any desired degree.

It will be noted that fluid under pressure supplied to chamber 8 may flow through passageway 32, choke 31 and annular groove 23 to passageway 54 but cannot escape from passageway 54 since the end thereof is lapped at the valve element 35. Therefore fluid under pressure supplied to chamber 8 is effective to deflect diaphragm 6 upwardly and, through the medium of stem 22, shift spool valve 18 relative to the wall of bores 10 and 13, upwardly until the upper end thereof engages the lower face of supply valve member 5 to close the communication between the fluid motor 60a and atmosphere.

When the pressure in the chamber 8 is built up sufiiciently to overcome the force of spring 17, spool valve 18 will continue its upward movement and unseat supply valve member 5 from its seat 15. With valve member 5 unseated, a fluid pressure communication is established from supply reservoir 62 through passageway 48, groove 43 in the valve element 35, port 47, passageway 44, chamber 14, past unseated valve 5 to bore 13 and thence through passageway 57 to the fluid motor 60a. Concurrently with the supply of fluid under pressure to the fluid motor 60a, fluid under pressure is also supplied to the chamber 9 through a branch of passageway 57, passages 50 and 52 of valve element 35, and passageway 53.

When the pressure of fluid in the chamber 9 and fluid motor 60a becomes substantially equal to the pressure of fluid in chamber 8, the spring 17 and fluid under pressure in chamber 14 act to seat supply valve member 5 on seat 15 With the supply valve member 5 in seated engagement with the upper end of spool valve 18 the exhaust valve member 4 is maintained closed when said supply valve member engages seat 15 and closes ofl the supply of fluid under pressure to the chamber 9 to prevent downward deflection of diaphragm 6. The relay valve device is now in lap position with the supply and exhaust valve members both closed and the pressure in chamber 9 and fluid motor 60a equal to the control pressure supplied by the control valve device 63 to chamber 8.

If the pressure in the fluid motor 60a is less than the pressure in supply reservoir 62 and it is desired to increase the pressure in said fluid motor, the control valve device 63 is again operated to supply fluid under pressure from said supply reservoir to chamber 8 to increase the pressure in said chamber. This increase in pressure in chamber 8 causes the diaphragm 6 and supply valve member 5 to be operated to again effect the supply of fluid under pressure to the chamber 9 and fluid motor 60:: until the pressures therein are equal to the increasedpressure in chamber 8.

When it is desired to release fluid under pressure from the fluid motor 690, the control valve device 63 is operated to close the communication for the supply of fluid under pressure from supply reservoir 62 to the passageway 45 and chamber 8, and to establish a communication between said passageway and an'atmospheric exhaust pipe 64 to permit the pressure in said chamber to be reduced to some chosen degree which may be atmospheric pressure or some pressure above atmospheric pressure.

Assuming that the several parts of the relay valve device are in lap position when fluid under pressure is vented from chamber 8, fluid under pressure in chamber 9 acting on the upper side of diaphragm 6 causes the diaphragm together with spool valve 18 to move downwardlyl When spool valve 18 starts to move downwardly from lap position toward release position in which position said spool valve is shown in Fig. l, the upper end of said spool valve, which constitutes the release With the release valve member 4 unseated, fluid under 1 pressure flows from the chamber 9 and connected fluid motor e061 to atmosphere by way of passageway 53, passa'ges' 52 andSti; passageway 57, bore 13, passageway 33',

chamber 11, and exhaust passage iz.

, If thepressure' retainediin chamber 3 is above atr'nos pheric pressure, the pressure in the chamber 9 and conneeted fluid motor 60zziwill1be reduced to a value slightly less than the pressure in said chamber 8 whereupon the diaphragm 6 and spool valve 18' will return to lap position inwhich the upper end of said spool valve engages the lower face of supply valve member .5 to cut off flow from; chamber 8' and fluid'm'otor 60a to atmosphere.

If thepre'ssure in chamber 8 is reduced to atmospheric pressure, the pressure in the chamber 9 and fluid motor 60;; will also. be" reduced to atmospheric pressure.

Subsequent to a partial or complete release of fluid under pressure from the fiuidjm'otor 60a, 'an increase in the pjressure Ofji'hfi fluid supplied to said motor can be efiected' to any desired degree by operation of the control valve device 63 to increase the pressure in chamber 8 to. said desired degree.

. V 7 Summary 7 'It will be seen fromrthe above description that I have V provided'a multi-purpo'se'control valve device including 7 a changeover valve which is manually operative to one position to condition the multi-purpose control valve device to operate at one timeflin one fluid pressure system as a' triple valve device which is operative in response to a reduction in brake pipe pressure, to effect the supply of fluid under pressure from an auxiliary reservoir to a brake cylinder until; the pressure of the fluid supplied to said cylinder corresponds to the reduction made .in said brake pipe pressure. The above-mentioned changeover valve" isfurther efiective' when manually operated to a second position to condition the multi-purpose control valve device to" operate at another time in another fluid pressure system as a relay valve device-which is operative upon the; supply of a control'fluid. pressure thereto to effectthe 'supply ofiiuid'under pressure from a separate supply reservoir to afluid motor which may be the brake cylinder of a railway vehicle or any type of industrial a pistonwhich can be operativel'yj connected to any device that can be actuated to any one of a plurality of positions; It will be apparent thatpif desired, other means'than the rotary type changeover'valve; as" disclosed herein, may be employed to convertthe multi p'urpose' valve device from a triple valve device to a' relay valve device or vice versa. For example, suitable removable screw-type plugs may be cylinder having therein 7, provided for appropriate. installation and removal to etfect the changes in'the connection of the passages with "thesame result as that accomplished bythe'chan'geover valve. 7 V d v 'Havi'ng now described theinvention, what I claim as new'and -desire to secure by Letters Patent is:

1". A ;rnulti-p.urpose valve device comprising valve means operative to control the supply of'fluid' under pressure to' and the release of fluid under pressure from a firstfl brake" cylinder, a movable abutment for operatingjsaid valve: means, and changeover means for at one time establishing a communication between a brake pipe anda first chamber atione side of said abutment and a communication between the inlet side of said valve means. and a'seco'nd chamber at the otherrside of said abutment to which second chamber an auxiliary reservoir is adapted tobe connected, thereby to enable fluid pressure control of the operation of said abutment to operate said valve means to cause said multi-pu-rpose valvesdevice to function in' the manner of a triple valve device, and for at another time establishing acommunic'a? 7 tion between a second brake cylinder connected to the 'under pressure therefrom;

outlet sideof said valve means and said fiirst'f chamber and" a communication between asource of fluid ressure and the inlet side of said valvemeans to enable fl'iiid pressure control of the operation of said abutment upon the supply of a control pressure" to said second chamber to operate said valve means to cause said multi-p'ui- 'ose valve device to function in the manner of are'la'y nected,- valve' means in said casing operative to control the supply of fluid under pressure to" said brake cylinder or to said receiving device and the release of fluid a movable abutmentfor opcrating said valve means, said abutment having a first chamber on'one' side and a second chamber ori'the' opposite side thereof, means providing acommunication between said second chamber and the" port means to which the auxiliary reservoir or the" operators control valve device maybe connected,a passageway in said casing providing a communication between said second chamber and the port means to which'said brake pipe is connected to enable charging of said second chamber and said' auxiliary reservoir, choke means controlling flow between said passageway and said second chamber, andchangeover valve means effective at said one time to establish communication from the port means to which the auxiliary reservoir and said second chamber are connected to the inlet; side of said valve means and from, the port means to which the brake pipe is connectedto said first chamber and said passageway to' provide for control of'said abutment in response to the'variation in pressure in the brake pipe to' operate said valve means to cause said multi-purpose valve devicetofunction in' the manner, of a triple valvedevice, said changeresponse to the supply of fluid under pressure to said second" chamber by operation of the operators control device to operate said valve means to cause said multipurposev'alvedevic'e'to function in the'm'anner of a relay valyedevice;

V 3". A multi-purpose valve device comprising a casing, a first portmean's' in said casing adapted to beopen' at one timetoatmosphere' and adapted to beco'nnect'ed at another time to a first external fluid pressure storage reservoir, a second port' means in said casing adapted to be connected at said one time to an external conduit such as a brake pipe a railway brake apparatus that'may be charged'witli fluid under pressure an'd adaptedto be open at said another timeto atmosphere, a" third port meansin said casing adapted'to be oo'nnectedat said' one time to a brake cylinder, and 'to be' connected at said another time to an external fluid pressure operated device, and a fourth port means in said casing" adapted" to be connected" at said one timeto an auxiliaryreservoir in a railway brake apparatusand to b'ec'onnected" at said another. time to the pressure delivery port of an operators' control device in aremot'e"control apparatus, valve means in said' casing operative at said onetime to control the supplyjof fluid under'pressurebetween said fourth port means and said thirdport" means't'o efiect" the supply "or fluid under" pressure to said cylinder} and operative at said another time to control the supply of fluid under pressure from said first port means to said thirdport means to effect the supply of fluid under pressure to said external fluid pressure operated device, a movable abutment for operating said valve means, said abutment having a first chamber at one side thereof and a second chamber on the opposite side thereof, said second chamber being connected to said fourth port means, and changeover means for at said one time establishing unrestricted communication between said second port means and said first chamber, restricted communication between said second port means and said second chamber and unrestricted communication between said fourth port means and the inlet side of said valve means to provide for fluid pressure control of said abutment in response to variations in pressure in said first chamber responsively to pressure variations in the external conduit connected to said second port means, thereby to operate said valve means to cause said multi-purpose valve device to function in the manner of a triple valve device, and for at said another time establishing communication between the outlet side of said valve means, said third port means and said first chamber, and communication between said first port means and the inlet side of said valve means, thereby to provide for fluid pressure control of said abutment in response to variations in pressure in said second chamber to operate said valve means to cause said multi-purpose valve device to function in the manner of a relay valve device.

4. A multi-purpose valve device for controlling supply of fluid under pressure to and release of fluid under pressure from a receiving device, said valve device comprising a casing having a supply chamber to which fluid under pressure may be supplied, a bore in said casing opening into said chamber, an annular valve seat on said casing at the juncture of said bore and supply chamber, a disc valve biased to seated position on said Valve seat, a movable abutment in said casing cooperating therewith to provide a first chamber at one side of said abutment and a second chamber at the opposite side, said bore opening into said first chamber, a spool valve slidably operable in said bore and connected to said abutment, said spool valve having one position in which it establishes a communication through which fluid under pressure is released to atmosphere from the receiving device and operable by said abutment into contact with said disc valve to effect closing of said release communication and then unseating of said disc valve to cause supply of fluid under pressure from said supply chamber to said receiving device, a first port means in said casing adapted -to be open at one time to atmosphere and adapted to be connected at another time to a first external fluid pressure storage reservoir, a second port means in said casing adapted to be connected at said one time to an external conduit that may be charged with fluid under pressure from such as a brake pipe in a railway brake apparatus, and adapted to be open at said another time to atmosphere, a third port means in said casing adapted to be connected to said receiving device which, at said one time, may be a first brake cylinder, and which, at said another time, may be a second brake cylinder, and a fourth port means in said casing adapted to be connected at said one time to an auxiliary reservoir in a railway brake apparatus and to be connected at said another time to the pressure delivery port of an operators control device in a remote control apparatus, a first passageway in said casing providing a permanent communication between said second chamber and said fourth port means, a second passageway in said casing connected to said second chamber, a third passageway in said casing connected to said first chamber and having a greater flow capacity than said second passageway, and changeover means for at said one time establishing a first communication through which fluid under pressure may be supplied from the auxiliary reservoir connected to said fourth port means to said supply chamber, and a second communication through which fluid under pressure may flow between the external conduit such as a brake pipe connected to said second port means and said second and said third passageways in said casing to eflect charging of said chambers and the auxiliary reservoir connected to said fourth port means in response to an increase in the pressure in the external conduit such as a brake pipe and operation of said abutment in response to a reduction in the pressure in the external conduit to operate said spool valve to cause said multi-purpose valve device to function in the manner of a triple valve device, and for at said another time establishing a third communication through which fluid under pressure may flow from the external storage reservoir connected to said first port means to said supply chamber and a fourth communication through which the pressure of fluid in said second brake cylinder connected to said third port means is communicated to said first chamber to enable operation of said abutment in response to the supply of fluid under pressure to said second chamber by operation of the operators control device connected to Said fourth port means to operate said spool valve to cause said multi-purpose valve device to function in the manner of a relay valve device.

5.' A multi-purpose valve device comprising a casing, a'first port means in said casing adapted to be open at one time to atmosphere and adapted to be connected at another time to a first external fluid pressure storage reservoir, a second port means in said casing adapted to be connected at said one time to an external conduit that may be charged with fluid under pressure from such as a brake pipe in a railway brake apparatus, and adapted to be open at said another time to atmosphere, a third port means in said casing adapted to be connected at said one time to a brake cylinder, and to be connected at said another time to an external fluid pressure operated device, and a fourth port means in said casing adapted to be connected at said one time to an auxiliary reservoir in a railway brake apparatus and to be connected at said another time to the pressure delivery port of an operators control device in a remote control apparatus, a supply valve for controlling at said one time flow of fluid under pressure between the auxiliary reservoir connected to said fourth port means and the brake cylinder connected to said third port means, and at said another time flow between said first storage reservoir connected to said first port means and said external fluid pressure operated device, an exhaust valve operable at said one time for controlling flow of fluid under pressure between the brake cylinder and atmosphere and operable at said another time for controlling flow of fluid under pressure between the external fluid pressure operated device and atmosphere, a movable abutment having a first chamber on one side thereof and a second chamber on the opposite side, said second chamber communicating with said fourth port means, and said abutment being operable by variations of fluid pressure in one of said chambers relative to that in the other chamber to control operation of said supply valve and said exhaust valve, and changeover valve means effective at said one time to establish a pair of communications of unequal flow capacity from said second port means :to said first chamber and to said second chamber respectively, and a third communication from said fourth port means to the inlet side of said supply valve to provide for fluid pressure control of said abutment to operate said supply valve and said exhaust valve to cause said multipurpose valve device to function in the manner of a triple valve device, and effective at said another time to establish a first communication from said first port means to the inlet side of said supply valve and a second communication from the outlet side of said supply valve and said third port means to said first chamber to provide for fluid pressure control of said abutment to operate snares m nti'qsuepwe valve device' toamnion in the manner of a? relay valve device;

V 6 A multipurpese valve' device comprising a easing; a portmean's insaid casingadapted to be open at one ti'rii'e t6 atmos here and adapted tobe connected at another-"tinie to'zi firstexternal-'- fluid pressure storage reservoin, a-seeondpert meansin said casing adapted to be con-- nected at said o'ii'e to an external conduit that may be charged with fluid under pressure from su'ch' as a brake pipe in a' railvvay brake apparatus', and adapted; to be open ar said another time to atmosphere, a third'port means" iii said-casing adapted to be connected at said one time to a b'rake cylindergand'to' be connected at said another time to external fluid pressureoperated device; and a four-tli p'o'r't means insaid casing adapted to be connected ats'aid one time'- to an auxiliary reservoir" in V a'r ail ay erake ppararueafidto be connected at said a'nkit tin' ie t the pressure-delivery port of an operators astrcontroldeviee a remote control apparatus,-valve means selectively effective to conhect said third port meansto at osjih'ere er to supply fluid under pressure to said third pert 'means, an abutmentoperatively' connected to V said valve-rneans and havin a first-chamber on' o'ne side thereof, and a second chamber oii the opposite side; s'aid fit ilieing dperable' by a-pre enderanee in pressure in one of said chambers for actuating said valve means",

a first passageway hi said casing' constantly connecting said s'eco'n'cl chainber-to'said fourtli port means whereby tlifiuid pressiirein' said seeond 'chamber conforms-at said 7 one time tb'tliatiifl' the auxiliary reservoir" and atsaid another time to th'at supplied by theoperators control device,- a' se'co'nd passageway'in said-casing; choke 'm'eans cefimcusgsaiws'eeerid passageway tosaidsecond cham o'er, ailiird p'assageway in said casingconne'cted-t'o said 'fii'st chamber, and changeover "valve means eif'ective' in one position atsaid one time to establish a first communication bet'we'e'ri-- said second port means and said secondand said third passageways to eiiect charging of 40 said first chamber from said secbndport means through said third-passageway and charging'o'f said' second chamber slid of the auxiliaryreservoirthrough said" second passageway and saidchoke means; and to" establish a second communication betweensaidfourth port-'m'eans and the inlet side" of said: valve means to provide for fl'uidpressure cei'itrol ofsaidabutment to operate said verve rneafiis-tocaiis'e sa'id' m'ulti purpos'evalve device to fiiiictionin the manner of I a triple'valve'de'vice, andfefie'c tiveliii an'otlfei" position at said another time to establish a tliird cornmunic'ation between said-firstportfin'e'ans and the-inlet side of said valve-11'1 eansand aiourthcomniunication between said tl'iird po'rt means and saidthird-pa'ssagew'ay and to clos'e communication between said second port means and pravidefor fl u'id pressure control ofsaid abutment to operate said valve means to cause'saidmulti p'urpose ewedeviceo fiiric t'ion' in" the mannerof a relay valve devicel l '71' In amiilti-purpose' valve device, the combination fitl'i'a ca'singliavmg-asuPply chamber, a first-port-means iirsa'ic'l' casintg-adapted tdbe' open-at one time to atmoseers arid-adapted to be connected at another time to a firsteiifernal fluid pressure storage reservoir-,- a second port casing adapted to be connected at" said one time to a brake cylinder; and'to be connected at said another time to an external fluid pressure operated device, and a fourth port means in said casing adapted to' be connectedat said one time to an'auxiliary reservoir in a railway brake apparatus and to be connected at said' another time to the pressure delivery portof' an operators control device in a' remote contrblapparatus; valve means selectively operable to connect said' supply chamber to said third port means or s'aidzthird'portmeans'to atmosphere, an abutment operatively connected to said valve means and subject opposing'ly to pressure offluid in a first chamber on one side thereof and asecond chamber onthe opposite side, saidsecond chamber being connected to firsfiportahd asecond port said rota ry valve being actu- 'said'fir'stand said second chambers to a able to one position for: at said one timeconditioning said-multi=purposevalvedevice for use as atriplevalve device; in-a railway brakeapparatus'in whichsaid first por'testablishes ;acommunication from said second chamber" and: sm'dfourth port means to said casing supply chamber whileclosingcommunication between said first sport means and; said casing supply chamber, and said secondport-establishesa communication'from said second pbrt rneans' to said pair of passageways'to efiect charging of said firstand said-second chambers and the auxiliary reservoir connected-to said fourth portmeans, while closing communieation'between said third port means and said-firstrchamber, andactuableto'a second position for conditioning "said multi-purpose valve clevice for use as relay valve device in a remote control} system-in which said first p0rt closes, communication from said second chamber and said fourth portmeans to said casingsupply chamber: andacip'ens a communication between saidfirst port means; and-said casing supply chamber, and said secondport closes communication from-said second port means'to saidpain of 'passageways andopens a communication between-said third port means and that one of 'said'pair o'f passagewayswonnected to said; first chamber.

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